I think there really isn't a grind in this game. By that I mean, a vehicle that sucks to use. Sure upper tiers take time to get to, that's suppose to work that way, but the vehicles themselves are fun to play. Ammo selection is key in AW since there isn't any premium ammo to use. Sabot, I've found, will often over pen certain parts of some vehicles and you won't damage a target, it just passes through. On the other hand, using HE or HEAT on ERA or some composites is a no go. Another thing I've notice is if one team camps to much they lose. Once a flank or sector falls, these vehicles are all so fast that they can exploit that quickly.